常用的φ750×1800mm磁选机的处理能力为（）吨/时。
A、20-30
B、30-40
C、20-40
D、30-50
参考答案：C
In front of the whole audience, Premiere Wen made his promise ______ the government would try its
best to solve the problem of poverty in China.[ ]
A. what
B. which
C. that
D. whether
出口奖励证制
