可自接损害生命中枢（呼吸、心跳）的脑疝为（）。
A.小脑幕切迹疝
B.枕骨大孔疝
C.大脑镰疝
D.蝶骨嵴疝
E.脑中心疝
参考答案：B
On December 28, 2009, a terrible tsunami happened in the coasts of South and Southeast Asia, _______ over 25,0000 people.
A．killing
B．had killed
C．killed
D．having killed
A．拉细绳的力F等于钩码重力G的
B．拉细绳的力F等于钩码重力G的
C．拉细绳的力F等于钩码重力G的
D．拉细绳下降的距离是钩码上升高度的
