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【单选题】
Which one of the following is true about the experience of ostracism?A.
It is often and harmful.
B.
It is rare but harmful.
C.
It is often but harmless.
D.
It is rare and harmless.
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举一反三
【单选题】If we have a tungsten anode (work function f =4.63 eV) and electron acceleration voltage of 35 kV, what is the minimum wavelength of the x rays? ( )
A.
3.89 nm
B.
0.0354 nm
C.
3.12 pm
D.
4.58 fm
【单选题】Write to me as soon as possible when you __ Beijing.
A.
reaching
B.
will get to
C.
reach
D.
arrive at
【单选题】审查批准药物临床试验、生产药品和进口药品的部门是
A.
所在地县(市)药品监督管理部门
B.
所在地省级药品监督管理部门
C.
国务院药品监督管理部门
D.
所在地省级卫生行政部门
E.
所在地县级卫生行政部门 依据《中华人民共和国药品管理法实施条例》的规定
【单选题】Don't forget to write to me as soon as you ___ Australia.
A.
arrive
B.
reach
C.
get
D.
come
【单选题】A bucket of water with total mass 23 kg is attached to a rope, which in turn, is wound around a 0.050-m radius cylinder at the top of a well. A crank with a turning radius of 0.25 m is attached to the...
A.
45 N
B.
68 N
C.
90 N
D.
135 N
E.
35 N
F.
15 N
【单选题】关于细胞因子,下列叙述错误的是
A.
一般是小分子蛋白
B.
与CKR结合后才能发挥作用
C.
主要以内分泌方式发挥作用
D.
生物学效应具有拮抗性和重叠性
E.
一种细胞可分泌多种细胞因子
【单选题】For a hydrogen atom in the 6f state, the minimum angle between the orbital angular momentum vector and the z axis is ( )
A.
45 O
B.
90 O
C.
30 O
D.
60 O
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