目前货车上使用的车架是哪种型式的（）
A、梯形车架
B、X形车架
C、框式车架
参考答案：A
Because of the terrible earthquake, some people in Ya’an became homeless and they had to ________the tents for the night.
A．put away
B．put up
C．put off
D．put down
本例如作全血胆碱酯酶活力测定，则全血胆碱酯酶活力值为多少时可诊断为中毒
A．＜100%
B．＜80%
C．＜70%
D．＜60%
