出入境证件签发机关、出入境边防检查机关对恐怖活动人员和恐怖活动嫌疑人员，有权决定不准其出境入境、不予签发出境入境证件或者宣布其出境入境证件作废。
参考答案：对
—Is the letter from your mother?
—Yes. But she ________ the letter herself, because she doesn't even know one word.
A．needn't have written
B．can't have written
C．might not have written
D．should not have written
基站开通后督导现场拨测属于（）
A.单站测试
B.单站优化
C.单站测试和优化
