单项选择题

A．

B．

C．

D．

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单项选择题

How does Joyce control her bad feelings, such as loneliness, anxiety or anger?

A．She always goes to the library.
B．She always goes jogging in the playground.
C．She always gets busy with other things.

单项选择题

在T－S图上，等焓线在两相区内外是不连续的。
A、正确
B、错误