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【单选题】
如图题7.2所示的反相比例运算电路中,通常平电阻 R p 的取值为( )。A.
R 1 // R 2
B.
R 1 + R 2
C.
R 1
D.
R 2
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皮皮学刷刷变学霸
举一反三
【单选题】The velocity of the wind,its steady direction,and the amount of time it has blown determines a wind driven current's
A.
____.
B.
temperature
C.
density
D.
deflection
E.
speed
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The surfaces of the tubes ar...
A.
10
B.
20
C.
40
D.
65
E.
15
F.
37.5
【单选题】The velocity of the wind,its steady direction,and the amount of time it has blown determines a wind driven current's ____.
A.
temperature
B.
density
C.
deflection
D.
speed
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The surfaces of the tubes ar...
A.
178.7
B.
53.2
C.
87.8
D.
128.5
E.
190
【单选题】Air at 1 atm and 10 °C flows across a bank of tubes 15 rows high and 5 rows deep at a velocity of 7m/s measured at a point in the flow before the air enters the tube bank. The surfaces of the tubes ar...
A.
2.51
B.
0.0251
C.
2.59
D.
0.0259
E.
0.0255
F.
0.0293
【单选题】关于人免疫球蛋白制剂,下述哪项是错误的?
A.
为多种特异性抗体混合物
B.
从血浆或胎盘血中分离制成
C.
可用于免疫缺陷病的治疗
D.
可用于甲肝、麻疹等病毒性疾病的紧急预防
E.
只含IgG类抗体
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