用叶中含梗测定仪和烟梗筛测定叶中含梗率,下列操作时间正确的有:()
A.3分钟
B.4分钟
C.5分钟
D.6分钟
参考答案:A, B, C
In the following essay, each blank has four choices. Choose the most suitable one from the four choices and write down in the answer sheet. Heterogeneous network environments consist of computer systems from (66) vendors that run (67) operating systems and communication protocols. An organization that (68) its computer resources is usually (69) the task of integrating its heterogeneous systems. Typically, each deparlment or division has defined its own network needs (70) OS, LAN topology, communication protocols, applications, and other components.
A. in general B. in any termC. in set terms D. in terms of
快件的赔偿责任分为哪几类?