柔性连墙件
参考答案：
采用钢筋作拉筋构成的连墙件。
. ---Li Ping often watches _______ English TV news in her spare time.
---No wonder she has _______ command of English.
A．/; a
B．an; the
C．the; /
D．an; a
下列物质中常温下既能与NaOH溶液反应，又能与盐酸反应产生氢气的是
[ ]
A．Mg
B．Cl2
C．Si
D．Al
