单词拼写（共10小题，每小题1分，满分10分）

小题1:He c_________ that we should come back before 9 o’clock.

小题2: An e___________ is a kind of machine for raising and lowering something.

小题3:If you want to read quickly and well, you should enlarge your v__________.

小题4:People aged from 13 to 19 are called t__________.

小题5: His friend has _________(遭受) from lung cancer for some years.

小题6:They carried out a s_________ of experiments to test the new drug.

小题7:The mother________(使平静) the little boy by telling him a story.

小题8:I’m rather _________(挂念的) about your health.

小题9:He made a long j_________ from Beijing to London.

小题10: The doctor p___________ him to give up smoking finally.

单双臂电桥测量电阻值的适用范围是（）

A、单双臂电桥都可以测量任何阻值的电阻；

B、单臂电桥适用于测量中值电阻，而双臂电桥适用于测量低值电阻；

C、双臂电桥只适用于测量低电阻，而单臂电桥测量电阻的范围不受限制；

D、单臂电桥适用于测量中值电阻，而双臂电桥测量电阻的范围不受限制。