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【单选题】
环境对系统作10kJ的功,且系统又从环境获得5kJ的热量,问系统内能变化是多少A.
-15kJ
B.
-5kJ
C.
+5kJ
D.
+15kJ
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【单选题】An American Shipowner can ______ in an American port any ship in the same ownership as the one with which he has collided，in spite of the fact that the collision may have occurred in some distant part...
A.
attack
B.
attach
C.
attain
D.
attend
【多选题】Where can you get a pet?
A.
Buy one in a pet shop.
B.
Ask someone to steal one for you.
C.
Buy one from a zoo.
D.
Wait for a baby pet from your friend's pet.
E.
Buy one from Taobao.
【简答题】,该正弦量的有效值为 A ,角频率为 rad/s ,频率为 Hz ,周期为 s ,初相位为 。
【单选题】I like your pet dog very much. But I can’t find _______ in the pet shop. Where did you buy _______?
A.
it, it
B.
it, one
C.
one, one
D.
one, it
【单选题】What is NOT the significance of the shift of business ownership?
A.
People can have income even they don't go to work.
B.
The employee won't blame the boss for his unfair allocation of profits.
C.
Workers won't complain about 'greedy corporations. '
D.
Retired workers can still receive money if they have contributed retirement plans before.
【简答题】随时间作周期替变化的应力称为___,作用在构件上随时间作周期性变化的载荷称为___。
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