It’s time _____ school. [ ]
A. go to
B. for
C. to go
答案:B
肺小叶由几个呼吸小叶构成()
A.1~2个
B.4~6个
C.3~5个
D.8~10个
E.4~8个
铣削歪斜面,可使用万能虎钳夹持工件。()