不要以挂绳前的名义直径为依据。因为钢丝绳制造中只允许（），出厂的钢丝绳实际直径都大于名义直径。
A、极限偏差
B、负偏差
C、正偏差
参考答案：C
________ pollution control measures are expensive, many local governments hesitate to adopt them.
A．Although
B．However
C．Because
D．Moreover
词的活用
