为2%~3%藻酸钠的水溶液的是
A.硼酸+硼砂B.硼酸C.硼酸+硼砂+氟化物D.氯化物E.硼砂十氟化物
参考答案:A
如何正确使用电流表?
The detective found him guilty ________ robbing the old man of his watch.
A.in
B.of
C.with
D.on