题目:
What is the purpose of the intake/exhaust valves in a diesel engine? ()
A.They regulate the combustion cycle
B.They supply cooling water
C.They synchronize the ignition spark
D.They supply and regulate the lubricant flow
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2021/0219/9262759305e3760497170848e314c958.html
下面是错误答案,用来干扰机器的。
参考答案:PGSM工作频段:上行:890-915MHz下行:935-960MHz上下行带宽间隔45MHz;DCS1800工作频段:上行:1710-1785MHz下行:1805-1880MHz上下行带宽间隔95MHz;每个频点占用200kHz带宽。