斜切口连杆常用的定位方法有（）。
A.止口定位
B.套筒定位
C.锯齿定位
D.螺栓定位
参考答案：A, B, C
据《灵枢·本神》，“肺气实”可见（）
A.鼻塞
B.少气
C.气喘
D.胸满
E.仰面呼吸
--- It’s difficult for the village children to cross the river for school.
--- I think a bridge _______ over the river.
A．should be built
B．is being built
C．has been built
D．was built
