关于房室交界区性逸搏错误的是()
A.与房室交界区自律性增高有关
B.是一种生理保护机制
C.房室传导阻滞时可出现
D.与迷走神经张力增高有关
E.显著窦性心动过缓时可出现
参考答案:A
— The teacher asked us ________________
A. What the bad effect of pollution are.
B. What were the bad effect of pollution.
C. What the bad effect of pollution were.
物理学中,力的单位是_______,托起一个苹果的力大约为_______.力的_______、_______、_______被称为力的三要素.