便利店员凭POS机购物小票开具发票,开票后,要在购物小票上加盖()印章。
A. “便利店”
B. “发票已开”
C. “销售”
D. “记账”
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Given the uncompleted code of a class: class Person { String name, department; int age; public Person(String n){ name = n; } public Person(String n, int a){ name = n; age = a; } public Person(String n, String d, int a) { // doing the same as two arguments version of constructor // including assignment name=n,age=a department = d; } } Which expression can be added at the "doing the same as..." part of the constructor?()
A. Person(n,a);
B. this(Person(n,a));
C. this(n,a);
D. this(name,age);
在液相色谱中,会显著影响分离效果的是()。
A. 改变固定相种类
B. 改变流动相流速
C. 改变流动相配比
D. 改变流动相种类
YS-8A型录波器故障前的记录时间为60ms
A. 正确
B. 错误