I appreciate()the opportunity to visit your factory.
A. having been given
B. to have been given
C. having given
D. to have given
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球团矿的堆密度一般在()之间。
A. 1.5t/m3~1.7t/m3
B. 1.6t/m3~1.8t/m3
C. 1.9t/m3~2.0t/m3
D. 1.8t/m3~1.9t/m3
网店的推广和营销大致分为哪几种类型?()
A. 联盟
B. 店内
C. 博客
D. 站内
E. 外部
凡能用电阻的串、并联等效化简的电路都是简单电路
A. 正确
B. 错误