磷钼黄分光光度法适用于( )中磷酸盐的测定。
A．锅炉水
B．地面水
C．循环水
D．工业污水
参考答案：A
The big fire in Shanghai, believed to ________ due to the burning of construction materials, caused
58 deaths and destroyed all the belongings of the people there.[ ]
A. have occurred
B. occur
C. have been occurring
D. be occurring
国债依存度是指( )占当年财政支出的比重。
A．当年国债发行额
B．国债余额
C．当年到期需偿还的国债总额
D．国债还本付息额
