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【判断题】
二力构件是指两端用铰链连接并且只受两个力作用的构件。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【简答题】二年级一班_____王老师负责。
【简答题】运动员在进行长距离游泳训练时,由于游泳池场地限制,常需掉头,影响训练的持续性。如何进行小池子的长距离游泳改造?
【单选题】Premature infants have apnea, mainly because of
A.
relatively small number of alveoli（肺泡）
B.
The respiratory center is relatively immature.
C.
few alveolar surfactant
D.
Intercostal(肋间肌) muscle weakness
E.
high position of diaphragm （膈肌）
【单选题】Premature infants are
A.
newborns with gestational age greater than 37 weeks and less than 42 weeks and weight more than 2500g
B.
newborns with gestational age greater than 37 weeks and weight less than 2500g
C.
newborns with gestational age greater than 37 weeks and weight more than 2500g
D.
newborns with gestational age less than 37 weeks
E.
newborns with gestational age of 37 weeks
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