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【单选题】
一般认为有生理活性的光敏素是()。
A.
Pr
B.
Pfr
C.
光敏素的生色团
D.
光敏素的蛋白质部分
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【单选题】有一并联管路,如图所示,两段管路的流量,流速、管径、管一长及流动阻力损失分别为qv1,u1,d1,L1,∑hf1及qv2,u2,d2,L2,∑hf2若d1=d2进,L1=2L2,当两段管路中流体均作层流流动时,qv1/qv2=()。
A.
1
B.
2
C.
4
D.
8
【单选题】世界上最大的潮汐发电站是( )。
A.
安纳波利斯潮汐电站
B.
朗斯潮汐电站
C.
基斯拉雅潮汐电站
D.
始华湖潮汐电站
【单选题】I can't find the book ________.
A.
nowhere
B.
anywhere
C.
everywhere
D.
somewhere
【单选题】有一并联管路,如图所示,两段管路的流量,流速、管径、管长及流动阻力损失分别为qv1,u1,d1,L1,Σhf1及 qv2,u2,d2,L2,Σhf2。若d1=2d2 ,L1=2L2。当两段管路中流体均作层流流动时,qv1/qv2为:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/2852d5995903cd1671c4845771741ebb.jpg">
B.
1
C.
2
D.
4
E.
8
【单选题】有一并联管路,如图所示,两段管路的流量、流速、管径、管长及流动阻力损失分别为qv1,u1,d1,L1,Σhf1及 qv2,u2,d2,L2,Σhf2。若d1=2d2 ,L1=2L2。当两段管路中流体均作层流流动时, u1/u2为:
A.
mg src="http://p.ananas.chaoxing.com/star3/origin/2852d5995903cd1671c4845771741ebb.jpg">
B.
2
C.
4
D.
1/2
E.
1/4
【单选题】I'm told that www.languagepractising.com is a free website ____ learners can not just learn vario
A.
29.I'm told that www. languagepractising .com is a free website ____ learners can not just learn various languages but also chat online. A.that
B.
which
C.
where
D.
Whose
【单选题】—I hope you can get good grades in the final exam. —____________.
A.
OK
B.
Sure
C.
I hope so
D.
I think so
【单选题】He helped me and I hope I can do something for him_______.
A.
in turn
B.
for return
C.
by turn
D.
in return
【单选题】I hope that I can hear from you ________
A.
quickly
B.
fast
C.
fastly
D.
soon
【简答题】I hope we can have some snow this winter.
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