—Excuse me, could you tell me ______?
—In about 20 days.
A:when we will have the exam
B:why we will have the exam
C:where we will have the exam
用下列哪种方法可以更好的除去因装修产生的大量有害气体( )
中国的空调产量占到了全球产量的80%,冰箱占到了54%,洗衣机是52%,全球有一半的电视机也产自中国,下列观点错误的是( )
铅蓄电池在生产、生活中使用广泛.其构造示意图如图1,回答下列问题: