唯物辩证法和形而上学的对立表现在( )。 A．前者坚持用运动发展的观点看问题，后者

After receiving large doses of an ovulatory stimulant such as menotropins (Pergonal), a client comes in for her office visit. Assessment reveals the following: 6 lb (2.7 kg) weight gain, ascites, and pedal edem().

A. These findings indicate which of the followingA. They are normal signs of an ovulatory stimulant.

B. The client is demonstrating signs of hyperstimulation syndrome.

C. The client is having a reaction to the menotropins.

D. The client is probably pregnant.

减压机构的作用是使（）在起动、预热和技术保养时，保持部分或全部气门都处于开启状态以减少曲轴旋转的阻力。

A.柴油机

B.燃气机

C.汽油机

D.混合燃料机

一般工程中，建筑材料占工程造价的（）左右，加强材料管理对于保证工程质量，降低工程成本都将起到积极的作用。

A.40%

B.50%

C.60%

D.70%

如何使用甲烷气体检测仪？