问答题

交通标志包括以下哪几种()

A.测速标志
B.指示标志
C.警告标志
D.禁令标志

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单项选择题

听力原文：W: This house won't be big enough when the new baby arrives in two months. I'm afraid we have to buy a big one.
M: But I don't see we can afford it right now, we can let Andy live with my mother then.
Q: What can we learn from this conversation?
(4)
A．They will buy a big house in two months.
B．A new baby will be born soon.
C．They will live with the man's mother.
D．The new baby will be sent to the man's mother.

A.
M:
B.
Q:
C.They
D.
B．A
E.
C．They
F.
D．The
G.

在单效薄膜式蒸发器中将番茄汁从12％浓缩至28％(固相质量分数)，料液预热至最高允许温度64℃后进入蒸发器，加热蒸汽绝压为170kPa(对应温度为114．8℃)，蒸发器的传热面积为1．8m2，传热系数为1450W／(m2．℃)，试计算加热蒸汽消耗量及料液处理量。

A.8℃)，蒸发器的传热面积为1．8m2，传热系数为1450W／(m2．℃)，试计算加热蒸汽消耗量及料液处理量。