原发性心肌损害的病因不包括（）
A.冠心病
B.贫血
C.心肌炎
D.心肌病
E.心肌淀粉样变
参考答案：B
—The boys of Class Two are going to the seaside this weekend.
—Um, remember _______ them _______ in the sea alone. It's dangerous. [ ]
A. to tell; not to swim
B. telling; swimming
C. to tell; swimming
D. telling; to not swim
回转速度慢或转不起来的故障现象及原因？
