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【单选题】
The typical sorting signal on a protein is a continuous stretch of amino acid sequence, typically ________ amino acids long. This signal sequence is often (but not always) removed from the finished protein once it has been sorted.
A.
10–30
B.
10–60
C.
15–40
D.
15–60
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【单选题】It's necessary that each child_____ the rules.
A.
must obey
B.
still obey
C.
obeys
D.
obey
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A.
were fulfilled
B.
was fulfilled
C.
be fulfilled
D.
would be fulfilled
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A.
learns
B.
should learn
C.
must learn
D.
learned
【单选题】It's necessary that the problem______in some way or other.
A.
is settled
B.
was settled
C.
be settled
D.
has been settled
【单选题】A 建设单位的一个施工项目由于资金困难而停工,但按照合同约定, B 施工单位仍有该项目的照管责任,该地区突遇山洪暴发,与该项目相邻的 C 单位在未与 A 、 B 单位联系的情况下主动帮助抗灾抢险, C 单位为此行为付出了一定的资金,该笔资金应当由 ( )负责
A.
A单位
B.
B单位
C.
C单位
D.
监理单位
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A.
A单位
B.
C单位
C.
B单位
D.
监理单位
【简答题】图中A,B,C点表示三个受外压的钢制圆筒,材质为碳素钢,σ s =216MPa,E=206GPa。试回答: (1)A,B,C三个圆筒各属于哪一类圆筒?它们失稳时的波形数n等于(或大于)几? (2)如果将圆筒改为铝合金制造(σ s =108MPa,E=68.7GPa),它的许用外压力有何变化?变化的幅度大概是多少?(用比值[P] 铝 /[P] 铜 =?表示)
【单选题】It's necessary that the problem______in some way or other.
A.
is settled
B.
has been settled
C.
be settled
D.
was settled
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A.
come
B.
came
C.
comes
D.
will come
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A.
甲单位
B.
乙单位
C.
丙单位
D.
监理单位
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