根据《无线通信系统室内覆盖工程验收规范》,试运行期间,室内覆盖系统应测试以下()。
A.接通率
B.掉话率
C.倒换成功率
D.通话质量
参考答案:A, B, D
— It shouldn't take long to clear up after the party if we all volunteer to help.
— That's right. ______. [ ]
A. Many hands make light work
B. Something is better than nothing
C. The more, the merrier
D. The sooner begun, the sooner done
准线方程为x=2的抛物线的标准方程是______.