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【判断题】
蝇类昆虫的蛹属于被蛹。A.
正确
B.
错误
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】The resonant angular frequency for a series RLC circuit is , when , the circuit is:
A.
resistive
B.
capacitive
C.
inductive
D.
none of the above
【简答题】主盘民警站位于嫌疑人左手侧,降低重心折腕控肘, 戒备民警位于嫌疑人右手侧, ,并进行语言控制“ !”,同时双警提拉; 再次进行语言控制嫌疑人“ ”继续提拉, 嫌疑人起身后,迅速 。
【简答题】若向量 的夹角为 ， ，则 = ；
【单选题】The circuit is in steady-state, when , the switch is opened. Then is:
A.
15V
B.
-15V
C.
0
D.
6V
【简答题】生产浓硫酸的吸收流程,转化气从塔底送入,进塔气温度 °C。浓硫酸从塔顶喷淋,喷淋酸温控制在 °C以下,出塔酸温用喷淋量控制,使出塔酸温 °C。
【单选题】A positive edge-triggered J-K flip-flop is used to produce a two-phase clock. However, when the circuit is operated it produces erratic results. Close examination with an oscilloscope reveals the pres...
A.
A race condition exists between the Q and Q outputs to the AND gate.
B.
A race condition exists between the CLOCK and the outputs of the flip-flop feeding the AND gate.
C.
The PRESET and CLEAR terminals may have been left floating.
D.
A race condition exists between the J and K inputs.
【单选题】Choose the one that best completes each of the following statements according to the text. When the circuit is broken anywhere, the circuit will stop carrying a _____.
A.
stream
B.
current
C.
terminal
D.
light
【简答题】若向量 的夹角为 ， ，则 = .
【简答题】设具有初始储能的电感元件,其电压与电流参考方向关联,则其伏安特性的时域关系式为 ,复频域关系式为 。
【简答题】若 ，则向量 的夹角为________.
相关题目：
【单选题】The circuit is in steady-state, when , the switch is opened. Then is:
A.
15V
B.
-15V
C.
0
D.
6V