The unwanted e-mail problem can be solved if ______.
A.the government takes action
B.a new technology is adopted
C.more people are aware of the problem
D.joint efforts are made and new technology is used
第5题
重力坝坝体排水措施是:靠近上游坝面设置(),其上下端与坝顶和廊道直通。坝基排水措施是()。
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