下列哪种心脏病常无震颤（） A.主动脉瓣关闭不全 B.动脉导管未闭 C.肺动

用句中划线部分词的反义词填空，使句意完整。

1. The bag is too heavy. You are not tall. You should carry the_____one.

2. His coat is_____. His mother wants to buy him a new one.

3. He says, "English is very interesting, but maths is_____."

4. My ruler is long. But his ruler is_____.

5. His father is very old. But he likes to play with _____ people.

患者咳嗽声重，气急咽痒，咳痰稀薄，头痛鼻塞，舌淡，苔薄白，脉浮紧。此属（）

A.痰湿蕴肺

B.风寒袭肺

C.风燥伤肺

D.风热犯肺

E.痰热郁肺

交接班检查时皮带司机把皮带各部的检查情况收集后，（）对设备进行试运行。

A.上班司机

B.本班司机

C.上下两班一起

D.机电工

磁罗经在磁极附近不能指向，其原因是（）。

A.地磁水平分力为零

B.地磁垂直分力为零

C.地磁总力为零

D.地磁场不稳定

轮胎发生偏磨和行驶（）可能由于主销、外倾角、前束、轮胎外倾角等存在问题。