纯钻进时间利用率
参考答案：
纯钻进时间占计入台月时间的百分比。
下列不能冷冻保存的临床标本是（）
A.脑脊液
B.尿液
C.伤口分泌物
D.深部脓液
E.胸水
—I’m considering _____ to Qingdao for my holiday by train.
—Why not try _____ by ship for a change?
going; to travel B. to go; traveling C. to go; to travel D. going; traveling
