国产天然气氨压缩浅冷装置启动制冷系统,水分馏塔底温度控制在()℃。
A.90~100
B.104~128
C.130~142
D.145~158
参考答案:B
Many people swarmed into big cities to seek their _____, but most of them failed.
A. money B. earnings C salary D. fortune
十二指肠降部梗阻立位典型征象是()
A.肠黏膜皱襞增粗、紊乱
B.肠壁增厚
C.肠腔积液
D.笔杆征
E.双泡征