【简答题】什么是网络病毒?网络病毒的来源主要有哪些渠道?
【简答题】什么是网络病毒? 网络病毒的来源有哪些?如何防止病毒?
【单选题】According to the passage, scientists over 40 face a choice ______.
A.
to face challenge by young people or to retire
B.
to continue their research or to work under new subject
C.
to exploit their endowment or turn to new subject
D.
to accept new challenge from young people or stay unproductive
【判断题】对于一定的混料机,有一最佳的装粉量,当粉末的装填率为80%时混合效率最佳。
【简答题】r____ v.remembera particular fact,,or situation from the past 回想;回忆起
【判断题】穿西服的时候也可以穿白袜子,反正没有人会在意
【单选题】According to the production possibilities diagram, point Y is:
D.
attainable only if the economy is producing efficiently