晚期声门下癌最常见的就诊症状是()
A.声嘶
B.咽部异物感
C.痰中带血
D.呼吸困难
E.颈部肿块
参考答案:D
One way to ________ species under threat of extinction—whatever the cause—is to remove them to zoos or parks and feed them there.
A.betray
B.resist
C.preserve
D.abandon
无瓦斯涌出的架线电机车巷道中的最低风速不得低于()。
A.0.25m/s
B.0.5m/s
C.1m/s
D.4m/s