磷化铝在存放中超过多少度易引起爆炸？
参考答案：当温度超过60℃时会立即在空气中引起、燃烧或爆炸。
He has a good command ________ maths and plays an important part ________ our team.
A．about; in
B．of; to
C．to; about
D．of; in
