往复泵的流量调节只能采用调节活塞的冲程,才能达到调节流量的目的。()
参考答案:错
解析:可以采用调节活塞的冲程和在泵出口处装旁路管线到进口处达到调节流量的目的。
TCP/IP () layer protocols provide services to the application () running on a computer. The application layer does not define the application itself, but rather it defines () that applications need—like the ability to transfer a file in the case of HTTP. In short, the application layer provides an () between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP () layer consists of two main protocol options—the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).
but rather it defines () that applications need—like the ability to transfer a file in the case of HTTP.
A.services
B.processes
C.applications
D.address
一个类中有______个析构函数。