管道在冷态时吊杆与铅垂线的倾斜度应不大于（）
A.1°
B.2°
C.3°
D.4°
参考答案：B
—Have you heard about the recent election?
—Sure, it _______ the only thing on the news for the last three days.
A．would be
B．is
C．has been
D．will be
幽门螺杆菌与空肠弯曲菌比较，最突出的特点是（）
A.属微需氧菌
B.生化反应不活泼
C.不发酵糖类
D.脲酶丰富
E.氧化酶试验阳性
