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如图所示，在四棱锥P－ABCD中，PA⊥底面ABCD，四边形ABCD为正方形，F为AB上一点．该四棱锥的正视图和侧视图如图所示，则四面体P－BFC的体积是_____．
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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
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【单选题】Write to me as soon as possible when you __ Beijing.
A.
reaching
B.
will get to
C.
reach
D.
arrive at
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【单选题】A motor drives a shaft at f=10 Hz and delivers P= 35 kW of power. The allowable shear stress in the shaft is 45 MPa. The minimum diameter of the shaft is approximately:【图片】
A.
35 mm
B.
40 mm
C.
47 mm
D.
61 mm
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【单选题】941 “手握成团 ,轻压即散”是指片剂制备工艺中哪一个单元操作的标准 ( )
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压片
B.
粉末混合
C.
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【判断题】当有人被烧伤时，以最快的速度用冷水冲洗烧伤部位。( )
A.
正确
B.
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【单选题】Write to me as soon as you ___ to Beijing.
A.
will get
B.
get
C.
got
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【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.
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【单选题】Please write to me as soon as you to Shanghai.
A.
arrive
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reach
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get
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【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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【单选题】He will write to me as soon as he()home.
A.
will have returned
B.
returns
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will return
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相关题目：
【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
查看完整题目与答案
【单选题】Write to me as soon as possible when you __ Beijing.
A.
reaching
B.
will get to
C.
reach
D.
arrive at
查看完整题目与答案
【单选题】A motor drives a shaft at f=10 Hz and delivers P= 35 kW of power. The allowable shear stress in the shaft is 45 MPa. The minimum diameter of the shaft is approximately:【图片】
A.
35 mm
B.
40 mm
C.
47 mm
D.
61 mm
查看完整题目与答案
【单选题】941 “手握成团 ,轻压即散”是指片剂制备工艺中哪一个单元操作的标准 ( )
A.
压片
B.
粉末混合
C.
制软材
D.
包衣
查看完整题目与答案
【判断题】当有人被烧伤时，以最快的速度用冷水冲洗烧伤部位。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】Write to me as soon as you ___ to Beijing.
A.
will get
B.
get
C.
got
查看完整题目与答案
【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.
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90 N
D.
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【单选题】Please write to me as soon as you to Shanghai.
A.
arrive
B.
reach
C.
get
查看完整题目与答案
【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
查看完整题目与答案
【单选题】He will write to me as soon as he()home.
A.
will have returned
B.
returns
C.
will return
查看完整题目与答案