一带电粒子在匀强磁场中做匀速圆周运动．已知磁场的磁感应强度大小为0.8T，a、b是带电粒子运动轨迹上的两点，粒子从a到b的时间为1.2π×10-5s，从b到a的时间为8π×10-6s，则该粒子的质量与其带电量之比m/q为（ ）．
A.2.0×10-6kg/C B.3.2×10-6kg/C C.4.0×10-6kg/C D.8.0×10-6kg/C
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A controversial decision on whether choice cuts of steak and cartons of milk produced from
Hundreds of pigs, cows and other animals created with the help of cloning are living (1)_____ farms across the United States and (2)_____ the forthcoming ruling will directly (3)_____ American consumers, British holidaymakers may also (4)_____ themselves at the forefront of a food revolution that many commentators expect will (5)_____ arrive here.(6)_____ the birth of Dolly the sheep—the first mammal cloned from an adult cell—there were extreme predictions of herds of genetically (7)_____ bulls and pastures (8)_____ with cloned dairy cows.That double (9)_____ of the past decade has not yet been realized (10)_____ clones have become a familiar sight at agricultural fairs in America, where producers of (11)_____ pigs and cattle have been among the first to (12)_____ cloning, which offers a way to keep (13)_____ traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, (14)_____ a way to improve animal healthy, (15)_____ the nutritional value of meat and milk, and breed animals immune (16)_____ diseases or better suited for developing countries.The safety of cloned (17)_____ has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18)_____ available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19)_____ scientific evidence suggests that there is little (20)_____ for alarm, at least on food-safety grounds.A．atB．withinC．onD．in
(6)_____ the birth of Dolly the sheep—the first mammal cloned from an adult cell—there were extreme predictions of herds of genetically (7)_____ bulls and pastures (8)_____ with cloned dairy cows.That double (9)_____ of the past decade has not yet been realized (10)_____ clones have become a familiar sight at agricultural fairs in America, where producers of (11)_____ pigs and cattle have been among the first to (12)_____ cloning, which offers a way to keep (13)_____ traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, (14)_____ a way to improve animal healthy, (15)_____ the nutritional value of meat and milk, and breed animals immune (16)_____ diseases or better suited for developing countries.The safety of cloned (17)_____ has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18)_____ available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19)_____ scientific evidence suggests that there is little (20)_____ for alarm, at least on food-safety grounds.A．atB．withinC．onD．in
That double (9)_____ of the past decade has not yet been realized (10)_____ clones have become a familiar sight at agricultural fairs in America, where producers of (11)_____ pigs and cattle have been among the first to (12)_____ cloning, which offers a way to keep (13)_____ traits without inbreeding problems caused by traditional methods. Clones of rare and elite animals, including sheep, goats, and rabbits, (14)_____ a way to improve animal healthy, (15)_____ the nutritional value of meat and milk, and breed animals immune (16)_____ diseases or better suited for developing countries.The safety of cloned (17)_____ has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18)_____ available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19)_____ scientific evidence suggests that there is little (20)_____ for alarm, at least on food-safety grounds.A．atB．withinC．onD．in
The safety of cloned (17)_____ has been under examination by various bodies. Three years ago the US National Academy of Science concluded that (18)_____ available data indicated that cloning met animal welfare and food safety considerations, more information was needed. (19)_____ scientific evidence suggests that there is little (20)_____ for alarm, at least on food-safety grounds.A．atB．withinC．onD．in
A．atB．withinC．onD．in
B．withinC．onD．in
C．onD．in
D．in
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四环素的抗菌作用机制A.影响胞浆膜通透性 B.与核糖体30S亚基结合，抑制蛋白质的合成 C.与核糖体
四环素的抗菌作用机制A.影响胞浆膜通透性B.与核糖体30S亚基结合，抑制蛋白质的合成C.与核糖体50S亚基结合，抑制移位酶的活性D.与核糖体50S亚基结合，抑制肽酰基转移酶的活性E.特异性地抑制依赖于DNA的RNA多聚酶的活性
A.影响胞浆膜通透性B.与核糖体30S亚基结合，抑制蛋白质的合成C.与核糖体50S亚基结合，抑制移位酶的活性D.与核糖体50S亚基结合，抑制肽酰基转移酶的活性E.特异性地抑制依赖于DNA的RNA多聚酶的活性
B.与核糖体30S亚基结合，抑制蛋白质的合成C.与核糖体50S亚基结合，抑制移位酶的活性D.与核糖体50S亚基结合，抑制肽酰基转移酶的活性E.特异性地抑制依赖于DNA的RNA多聚酶的活性
C.与核糖体50S亚基结合，抑制移位酶的活性D.与核糖体50S亚基结合，抑制肽酰基转移酶的活性E.特异性地抑制依赖于DNA的RNA多聚酶的活性
D.与核糖体50S亚基结合，抑制肽酰基转移酶的活性E.特异性地抑制依赖于DNA的RNA多聚酶的活性
E.特异性地抑制依赖于DNA的RNA多聚酶的活性
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某基金管理公司募集了三只公募基金，其中两只为货币市场基金，一只为股票型基金，下列说法正确的是（）
A.该基金管理公司和三只基金各自作为会计主体
B.该基金管理公司为会计主体，二只货币市场基金为会计主体，股票型基金为会计主体
C.该基金管理公司为会计主体，三只基金为会计主体
D.该基金管理公司和三只基金为同一会计主体
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