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【单选题】
利用伯努利方程解题时,截面的选取应遵循的原则是( ).A.
两截面与流动方向垂直，而且两截面的流体是连续的
B.
两截面与流动方向平行；而且两截面的流体是连续的
C.
两截面与流动方向平行；两截面的流体可以不连续的
D.
两截面与流动方向垂直
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皮皮学刷刷变学霸
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【单选题】The battery-operated slippers are used for _____ in the dark. [ ]
A.
seeing
B.
see
C.
saw
D.
sees
【判断题】All-electric vehicles (EVs) run on electricity only. They are propelled by one or more electric motors powered by rechargeable battery packs.
A.
正确
B.
错误
【多选题】1960年签订了《日美共同合作和安全保障条约》(新日美安全条约),该条约与1951年的《日美安全保障条约》有何不同?
A.
删除了美军镇压日本内乱及不经过美国同意不得给予第三国基地等内容，部分恢复了日本主权。
B.
明确了美国对日本的防卫义务。
C.
增加日美政治经济合作等内容。
D.
设定了条约有效期为10年，到期后缔约方可以提出废除。形式上增加了日美关系的对等性。
【简答题】CA: I mean, those battery packs are incredibly heavy, but you think the math can still work out inteltly -- by combining light body, heavy battery, you can still gain ______efficiency.
【简答题】水力学的研究方法有()、()和()
【简答题】填明“现金”字样的银行汇票不得背书转让。
【单选题】The battery packs used in electric and hybrid automobiles are one of the largest cost components for manufacturing these cars. As the price of these batteries decline, we expect that the:
A.
supply curve for electric and hybrid autos will shift rightward.
B.
supply curve for electric and hybrid autos will shift leftward.
C.
demand curve for electric and hybrid autos will shift rightward.
D.
demand curve for electric and hybrid autos will shift leftward.
【单选题】Battery-operated slippers are used for _______ and were invented by _______. [ ]
A.
seeing in the dark; Chelsea Lanmon
B.
seeing in the dark; Julie Tompson
C.
scooping really cold ice cream; Jayce Coziar
D.
changing the style of the shoes; Jamic Ellsworth
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