选择题:3、(1分) Successful language learning is active, so

题目内容:
3、(1分)
Successful language learning is active, so successful learners _________.



A)
wait for a chance to use the language
B)
look for a chance to use the language
C)
only use the language in class
D)
try to avoid using the language
参考答案:

汽轮机在运行过程中引起凝汽器真空缓慢下降的原因除了有冷却水量缓慢减少、冷却水管结垢或脏污外,还有哪些

汽轮机在运行过程中引起凝汽器真空缓慢下降的原因除了有冷却水量缓慢减少、冷却水管结垢或脏污外,还有哪些?( )

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