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【单选题】
在配电总盘及母线上进行工作时,在验明无电后应挂临时接地线。临时接地线应先接( )。
A.
导体端
B.
接地端
C.
随便
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【单选题】电路如下图所示,若已知电流 I =1A ,则 U ab 为( ) V 。
A.
23
B.
-23
C.
3
D.
-3
【单选题】What means of communication is used by most people?
A.
Facial expressions.
B.
Body movements.
C.
Speech.
D.
Body movements and speech.
【单选题】Tom and David are both my good friends. David seems very serious, _____ Tom has a good sense of humor. [     ]
A.
when
B.
where
C.
which
D.
while
【单选题】()是一种新型建筑材料,选用强化钢丝焊接而成的三维笼为构架,阻燃EPS泡沫塑料芯材组成,是目前取代轻质墙体最理想的材料
A.
泰柏板
B.
泡沫板
C.
泡沫钢丝板
D.
轻质复合板
【单选题】电路如下 图 所示,已知 U 1 =1 V , U 2 = - 1 V , U 3 =2 V , U 4 = - 2 V ,则 U 5 = ( )。
A.
- 2V
B.
2V
C.
0V
D.
- 3 V
【单选题】Body movements are necessary in order for the listeners to______.
A.
understand the music completely
B.
enjoy the music fully
C.
appreciate the music
D.
hear the music
【简答题】热线式空气流量传感器由 、 、精密电阻、集成电路控制板、防护网、取样管和电插接器等组成。
【简答题】由理想运放组成的电路如下图所示,已知输出电压u o 与三个输入电压u 1 ,u 2 和u 3 的关系满足u o =au 1 +7u 2 +bu 3 ,试求系数a,b和R F 的阻值。
【简答题】板 选用强化钢丝焊接而成的三维笼为构架,阻燃 芯材,或岩棉板组成,是轻质墙体材料;
【单选题】Though different body movements mean different things in different cultures, ______smile is ______ accepted as a sign of happiness or being friendly. [     ]
A.
the ; universally
B.
the; usually
C.
a; globally
D.
a; universal
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