pH值过高或过低PHP的絮凝效果都（）。
A、差
B、好
C、不影响
D、无法判断
参考答案：A
_____ all the demands had been refused _____ to go on strike.
A．Only; did the workers decide
B．Not until; the workers decided
C．Not until; did the workers decide
D．Only after; the workers decided
评标的工作目标是确定中标候选人，中标候选人一般取( )名。
A．1～3 B．1～5C．1～6 D．1～10
