对镍铬不锈钢铸件进行碱煮，所用氢氧化钾水溶液的浓度是（）
A．10%
B．45%
C．25%
D．20%
E．30%
参考答案：B
With a lot of difficult problems ______, the newly-elected president is having a hard time.
A．settled
B．settling
C．to be settled
D．to settle
总行拨付给分支机构外汇营运资金的总额，不得超过自身外汇资本金总额的（）
A.30%
B.40%
C.50%
D.60%
