荷载分为( )。
A．永久荷载
B．恒荷载
C．可变荷载
D．必然荷载
E．偶然荷载
参考答案：A,B,C,D
She started studying medicine at college, but ______ to Business Studies in her second year.
A．transformed
B．skipped
C．adjusted
D．switched
人工呼吸应在安全地点进行,但尽量就地进行
