抽水试验有观测孔时，应以最远观测孔稳定（）小时为准。有特殊要求时可适当延长。

But when I got _______ the town ought to have been, all I found was a gas station．

A．where

B．which

C．what

D．that

This factory has so far produced________ as last year. [ ]

A. as many three times cars      

B. three times as many cars 

C. as many cars as three times

D. three times more cars than

染性心内膜炎的基本概念是（）

A.心脏内膜表面的细菌感染

B.心脏内膜表面的微生物感染伴赘生物形成

C.心脏内膜表面的物理损伤

D.心脏内膜表面的病毒感染

E.心脏内膜表面的化学损伤

电杆立入洞，经看正、扶植后，应立即回土夯实应分层进行，每回填土（）厘米应夯实一次。

A.10

B.20

C.30

D.40

患儿男，生后2天，出生体重为2400g。因吸入性肺炎入院，入院时患儿呼吸急促，口唇稍发绀。即置于辐射保暖床上抢救。

该患儿吸氧的流量应选择每分钟为（）

A.1L

B.2L

C.3L

D.4L

E.5L