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【多选题】
平抛运动是A.
匀速率曲线运动
B.
匀变速曲线运动
C.
加速度不断变化的曲线运动
D.
加速度恒为重力加速度的曲线运动
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反馈参考答案：
举一反三
【简答题】If he loses the case, Michael will have to __________ the bill for legal costs.
【单选题】If he loses the case, Michael will have to______ the bill for legal costs.
A.
pick up
B.
pick out
C.
turn up
D.
turn out
【简答题】同上 If he loses the case, Michael will have to pick up the bill for legal costs.
【单选题】The system includes various safety devices such as ______ and ______ which can be closed in the of a fire.
A.
booster pump ,viscosity regulator
B.
low-level alarm ,booster pump
C.
remotely operated tank outlet valves ,viscosity regulator
D.
low-level alarm ,remotely operated tank outlet valves
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