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【简答题】
在工程中我们将结构中只承受两个力作用而平衡的杆件称为 ,可以是直杆,或其他杆件,但必须是直杆。在画受力图时通常先找出二力杆,然后再画出其他物体受力图。
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举一反三
【单选题】—I lost my money. —_________ .
A.
Oh, you will be more careful
B.
Oh, you must be more careful
C.
Oh, you would be more careful
D.
Oh, you should have been more careful
【单选题】Which of the following ways can help people prevent from bacteria?
A.
Smell and have a careful look at the food.
B.
Only eat the food stored in refrigerator.
C.
Ensure the food is totally heated before eating.
D.
Eat the food before they are thawed.
【简答题】It's very ______ of you not to talk aloud while the baby is asleep. A) concerned B) careful C) considerable D) considerate
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