账户上期的期末余额转入本期，即为本期的期初余额；账户本期的期末余额转人下期，即为下期的期初余额。
参考答案：对
On his way to the airport, it ________ him all of a sudden that he had forgotten her birthday.
A．hit
B．knocked
C．occurred
D．beat
适用于填土、粉土、砂土和粘性土的降水井点是（）
A、型井点
B、管井井点
C、电渗井点
D、深井井点
