圆锥或圆柱滚子轴承的内圈尺寸若能确定修复时，可采用（），然后车削整形、抛光、装配。

焦炉调火中所测得各项压力均为相对压力。

关于侵蚀性葡萄胎与绒毛膜癌的鉴别，正确的是（）

A.尿中hCG高者为绒毛膜癌

B.有肺转移者为绒毛膜癌

C.前次妊娠为足月产者是绒毛膜癌

D.镜下见不到绒毛结构者为侵蚀性葡萄胎

E.症状严重者为绒毛膜癌

油罐液体计失灵可能造成的（）事故.

A.油罐抽瘪

B.油罐跑油

C.油罐罐壁鼓包

D.油罐溢油

Uncle Li and Uncle Wang are good friends. They live next to each other and their farms are both at the foot of the mountain. So they can help each other. But neither of them likes to use his head. They’re both poor though they work hard. Most villagers have built new houses, but they still live in the low and broken houses. They never find out why.
Once Uncle Li went to the town to buy some medicine for his wife. In the town he heard apples in a city were expensive. He told Uncle Wang about it as soon as he went back. They decided to carry some apples to the city. They borrowed some money from their friends and bought nearly 1,000 kilograms of apples in the villages and carried them to the city on a tractor. Bad luck! A lot of apples has already been carried there when they arrived. A few days later they had to sell them at a low price. They felt unhappy and returned to their village.
"I can’t understand why we sustained (蒙受) losses in business while others always profit (盈利)" Uncle Li asked one day.
"The tractor was too small" Uncle Wang said without thinking. "We’ll carry more apples on a truck next time!"
"I agree!" said Uncle Li. "How foolish we were!\

Uncle Li and Uncle Wang live in the low and broken houses because ______.

A．they hope to save money

B．they’re both poor

C．their farms are at the foot of the mountain

D．they’re not far from their farms

与数学式

对应的C语言表达式是（ ）。

A．3*x^n/(2*x-1)

B．3*x**n/(2*x-1)

C．3*pow(x，n)*(1/(2*x-1) )

D．3*pow(n，x)/(2*x-1)