在一定的水质条件下,水中氯离子的含量与溶解固形物的比值近于常数,因此,在实际锅炉运行中,通常测出水中氯离子的含量来了解锅水中溶解固形物值,从而控制锅炉排污量。()
参考答案:对
俯仰操纵力矩是飞行员操纵驾驶杆偏转升降舵时()上产生的附加升力对重心形成的力矩。
A.升降舵
B.水平尾翼
C.飞机
Originally introduced by Netscape Communications, (66) are a general mechanism which HTTP Server side applications, such as CGI (67) , can use to both store and retrieve information on the HTTP (68) side of the connection. Basically, Cookies can be used to compensate for the (69) nature of HTTE The addition of a simple, persistent, client-side state significantly extends the capabilities of WWW-based (70) .
A. fixedB. flexibleC. stableD. stateless