问题
选择题
The plane must be ready within half an hour. There should be no _____ in sending the blood and medicine
to the injured people. [ ]
A. hurry
B. delay
C. time
D. wait
答案
答案：B
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The plane must be ready within half an hour. There should be no _____ in sending the blood and medicine
to the injured people. [ ]
A. hurry
B. delay
C. time
D. wait
答案：B
Fe2O3+X+SO3↑ ，则X的化学式是[ ]