《煤矿安全质量标准化标准》规定，液压支架初撑力不低于规定值的百分之多少？
参考答案：
80%
When the waiter saw the man in rags coming into the restaurant, he looked down upon him but had
to offer some service to him. [ ]
A. unwilling
B. willing
C. wonderful
D. excellent
