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【单选题】
漏出液的细胞计数多低于A.
100×10^6/L
B.
400×10^6/L
C.
200×10^6/L
D.
300×10^6/L
E.
500×10^6/L
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【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】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】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
【单选题】He will write to me as soon as he()home.
A.
will have returned
B.
returns
C.
will return
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