贴壁依赖

把70%的硝酸（密度为1.44g/cm³）与等体积的水混合，所得稀硝酸中溶质的质量分数是[ ]

A.等于35%

B.小于35%

C.大于35%

D.无法确定

This is a famous street in China. What is it It’s West Street. Why is it so famous Now let me tell you something (41) it.
West Street is in Yangshuo, Guangxi. It’s over 1,400 years (42) .It’s about 1,000 meters (43) . But it’s very clean and beautiful. In the street, there are (44) shops. The things in the shops are nice and cheap. Every day, lots of visitors come here. Many of (45) are foreigners. It’s a good place to practice speaking English. So West Street is called the biggest English corner. Some people (46) call it the earth village. Almost everyone in the street (47) English.
But you mustn’t ride your bike or drive your car in the West Street. You can only (48) here. Why Because it’s a walking street. In the street, you needn’t worry that you’ll be hit by cars. (49) happy!
West Street is a wonderful place to visit. (50) West Street.

[A] they [B] them [C] their

最可能的诊断是

A．脾破裂

B．胃穿孔

C．肾损伤

D．肠破裂

E．胰损伤

读图，回答下列各题。

A点位于C点的（）

A.东北

B.正西

C.西北

D.正东

一直径为200m的圆管其中的流体为紊流流动，其管径突然缩小为100mm时，其局部阻力系数是多少？