慢性肝炎患者，腹围逐渐增大，判断有无腹水的腹部检查是（） A.听诊有振水音 B.叩诊

病毒性心肌炎患儿一般总休息时间不少于（）。

A.2个月

B.3个月

C.4个月

D.5个月

E.6个月

Tony decided to study abroad _______ he knew he would meet many difficulties.

A．as if

B．because

C．unless

D．even if

The car is too ________, I can't buy it.[ ]

A. cheap

B. dear

C. nice

D. good

人体日需要NaCl为

A．3.5g

B．4.0g

C．4.5g

D．5.0g

E．5.5g

检修对停电级数有哪些要求？