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【单选题】
甘氨酸的Pk-cooH==2.34,pK-NH2=9.60,故它pI为( )A.
11.94
B.
7.26
C.
5.97
D.
3.63
E.
2.34
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举一反三
【简答题】在PowerPoint 2000中可以利用______、______和______等三种方法创建演示文稿。
【简答题】短文填词。 When a young man starts to earn his own living,he can no longer expect others to pay _____ his food, his clothes, or his room, but he has to work if he wants to live _____(舒适)．If he spends most ...
【单选题】He _____ football regularly for many years when he was young.
A.
played
B.
was playing
C.
has played
D.
had played
【单选题】PowerPoint 2000中,执行“文件/关闭”命令,则( )。
A.
关闭PowerPoint 2000窗口
B.
关闭正在编辑的演示文稿
C.
退出PowerPoint 2000
D.
关闭所有打开的演示文稿
【多选题】反梁式楼梯的正确描述是
A.
斜梁可位于踏步板的上方、踏步包在梁内 .
B.
其特点是梁与踏步形成的凹角在上面
C.
对楼梯间卫生较为有利， 污水不易到板底， 但梯段净宽减少。
D.
适用于荷载较大、层高较大的教学楼，商场等建筑。
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