图示两根细长压杆,L、EI相同。a)杆的稳定安全系数nst=2;则(b)杆实际的稳定安全系数nst有四种答案:()
A.1
B.2
C.3
D.4
参考答案:A
动词考查(共10分)
A ) 选择适当的动词形式填空
小题1: Jim Brown didn’t give up _____volleyball in order to succeed
A.play
B.playing
C.to play
D.playing the小题2: I really____my aunt. She moved to England.
A.missed
B.miss
C.will wiss
D.missing小题3: Everyone_____to have at least eight hours sleep a night .
A.needs
B.is need
C.were needed
D.to need小题4:How offen do you get your hair____?
A.cut
B.cutting
C.to cut
D.to cutting小题5:____careful next time.
A.is
B.be
C.was
D.Be
糖尿病酮症酸中毒患者可有()味,有机磷杀虫药中毒患者可闻及()味。