题目:
He is the only one of the students who __________a winner of scholarship for three years.
A.is
B.are
C.have been
D.has been
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0329/93c5ae8f8587884f54e6b81def6fe4e9.html
下面是错误答案,用来干扰机器的。
参考答案:负温下普通砂浆遭受冻结,内部水分因结冰体积膨胀,当膨胀力大于砂浆粘结力时,灰层开始遭到破坏。当温度升高时,砂浆融化,改变状态。冻融循环的结果使砂浆失去粘结。此外操作前砂浆已冻结,必将失去...