对人造石和普通石膏的描述，错误的是A．人造石膏凝固时间长 B．_爱下问搜题

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问题单项选择题

对人造石和普通石膏的描述，错误的是

A．人造石膏凝固时间长

B．人造石膏凝固膨胀小

C．人造石抗压强度较大

D．人造石物理性能优于普通石膏

E．人造石化学性质优于普通石膏

答案

参考答案：E

完形填空

完形填空
From Monday 1 Friday, American students usually get up at seven. Then they wash their faces and 2 . They usually have eggs, bread, fruit and a glass of milk. After breakfast, they 3 on footor by school bus. Some students ride bikes to school. They get to school 4 eightthirty. Then they put their backpacks in their lockers and 5 . Only one book, a table and a pencil to each class. In middle school, students have classes for six 6 . Their classes are usually English writing, math, history, 7 , P. E. and art. 8 students have lunch at school. They usually have meat, vegetables, fruit, bread and drink. 9 most students like pizza, hot dogs and hamburgers better. Students 10 have a short sleep. They go back to have classes after lunch until three o'clock. Then they 11 . Students usually play 12 sports or watch TV before dinner. They have dn er at six 13 . They usually have soup, meat, vegetables, rice or pasta. 14 they do their homework with their parents. Sometimes they play or talk with their parents. On Saturday they often go shopping, 15 their grandparents or go to a park with their parents. And on Sunday they go with their parents to church in the morning and have a big dinner at one o'clock in the afternoon.
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多项选择题

某工程单代号网络计划图如下，下列选项正确的是（）。

A．工作A的EF为2天

B．工作D的PP为2天

C．工作C的EP为2天

D．工作B的PP为1天

E．工期为8天