
基孔制用H表示,基本偏差的上偏差为零。


Fill in each of the blanks in the following sentences with a word or phrase from the Words & Phrases to Drill box. Change the forms where necessary.
(1) If you have worked hard , you won't have to sit up all night (熬夜) before the exam.
(2) I think we should let Mary go camping with her classmates. , she is a big girl now.
(3) Since you are so busy, you do need a very secretary.
(4) As a fireman, you must be ready to hardships (困苦) and even suffer death.
(5) They did a lot of work but refused to take any pay.
(6) Let's go to the park. It's just .
(7) Prof. Smith is not a stranger to us. We've met him on several .
(8) Jim had a problem with his car, but he fixed it himself.
(9) They've for her to be operated on by the best doctors.
(10) Our history professor explained the cause of the First World War.
(11) The old lady likes to be alone, and only goes out on very occasions.
(12) He hasn't got enough clothes on — look, he's with cold.
(13) After much thought, we agreed to let him go.
(14) To the old lady's great , Myra did not come, nor didi she send her any present.