停电后环氧乙烷精制塔回流泵自启动时间是()秒。
A、10
B、12
C、6
D、15
参考答案:A
—Whose ball is this?
—It's _______. [ ]
A. Jim's and Tom's
B. Tom's and Jim
C. Jim and Tom's
子宫肌瘤最常见的变性是
A.肉瘤变B.钙化C.玻璃样变D.囊性变E.红色变