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【简答题】
使用任何机械时，机械效率总是小于______．
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皮皮学刷刷变学霸
举一反三
【单选题】Trying to get Americans to eat a healthy diet is a frustrating business. Even the best-designed public-health campaigns cannot seem to compete with the tempting flavors of the snack-food and fast-food...
A.
public-health campaigns cannot compete with tempting flavors.
B.
snack-food and fast-food industries are flourishing in the US.
C.
most food in America are profoundly rich in fat and sugar.
D.
fat people account for a large proportion of American population.
【单选题】The roof fell before he had time to ________ the room to save his baby. [ ]
A.
dash off
B.
dash into
C.
dash out
D.
dash up
【简答题】AV Clip 2: DASH Eating Plan Listen to a passage “DASH Eating Plan” and complete the following guided summary. It’s known as the “DASH Eating Plan.” In fact, DASH stands for (1)_____________________. T...
【简答题】混凝土结构中采用的钢筋有___和__ 两种,一般普通钢筋为____
【单选题】The agency’s ruling (crippled) their plans.
A.
enhanced
B.
prompted
C.
impaired
D.
advanced
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