每分通气量和每分肺血流量之比是
A.气体的扩散速率B.气体的扩散系数C.肺扩散容量D.气体分压E.通气/血流比值
参考答案:E
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
快递服务的根本制胜点是()。
A、快速准确
B、热情服务
C、团结协助
D、诚实守信