当瓦斯保护本身故障值班人员应（）打开，防止保护误动作。
A.跳闸连接片
B.保护直流取下
C.瓦斯直流
D.不一定
参考答案：A
慢性淋巴细胞白血病易并发（）
A.红皮病
B.结肠癌
C.低丙种球蛋白血症
D.上腔静脉压迫综合征
E.肾功能不全
________ it is, the boy never seems to be able to finish it off.
A．However interesting a book
B．Whatever interesting a book
C．How interesting a book
D．What an interesting book
