两个连在一起的皮带轮,大轮直径是3分米,小轮直径是1分米5厘米,大轮转一周, 小轮要转( )周。
2
I'm afraid there _______________ a heavy rain tonight. [ ]
A. will have
B. is going
C. will be
D. is going to have
经皮内镜下穿刺胃空肠造口术禁忌证是()
A.急性胰腺炎
B.上消化道不全梗阻
C.高位肠瘘
D.大量腹腔积液者
E.胃食管反流