正常工作环境下全量程检测仪检测传感器工作寿命（）年以上。A、半 B、一 C、二 D、

—He has a lot of friends who have a lot in ________ common with himself.

—Indeed.Birds of ________ feather flock together.

A．the; /

B．the; a

C．/; a

D．a; the

多项式2a²b-3ab-3a+2 是______次______项式，其中第二项是______．

小华给小明写下了这样一组数据：10、40、80、40、90、30、50、50、40、20，其中这组数据的中位数是______．

_____ I know, Plato (柏拉图) was a great thinker in ancient Greece. [ ]

A. As far as

B. As long as

C. As well as

D. As many as

在滚动轴承的各空穴处，应充满润滑脂，而轴承室最多只需充到（）容积处，以避免温升过高。

A.2/3

B.1/2

C.1/3

D.1/4