调整蒸汽阀门时要戴好手套,避免烫伤。
参考答案:对
—I like playing Chinese chess best. What about you?
— football is my favourite sport.
A.the, The
B.the, \
C.\ , The
D.\ , \
下列试剂能鉴别NaCl、NaBr、NaI三瓶无色溶液的试剂是()
A.AgNO3和稀HNO3
B.氯水和CCl4
C.石灰水
D.碘水和淀粉