
布氏杆菌感染人的途径可以是()。
A.皮肤黏膜直接接触感染
B.经消化道感染
C.经呼吸道感染
D.A+B
E.A+B+C


A.皮肤黏膜直接接触感染
B.经消化道感染
C.经呼吸道感染
D.A+B
E.A+B+C
变压器变比等于一二次侧额定电压之比。
Listen to the passage twice and fill in the blanks with what you hear.
Getting your products to your customers on time, in good condition and at a reasonable cost, is very important. As for the means of shipping your products, that decision should be made _______1______ your business needs and budget.
Four main means of transport are used internationally. Road transport is ______2________ choice for shipping goods within a country. Prices are different according to whether the shipment is a full-truck load or a less-than-full-truck load. The railway is another important means of transport within a country, particularly where roads are _____3_________. Air transport is the most expensive choice. However, it has the advantages of speed, reduced insurance and ______4_______. Water transport is used mainly for heavy goods. It is the slowest but least expensive mode of transport.
Besides means of transport, you will also need to pay attention to product packaging and insurance. Packaging protects your goods from shipping damage. It is ________5__________ that you insure your products. Insurance protects you against financial loss when products are stolen, damaged, delayed or accidentally lost.