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【单选题】
在计算机硬件系统中“Bus”的含义是（）。就是连接CPU、存储器和输入输出设备等的公共信息通道。A.
总线
B.
主机
C.
网络传输
D.
公共汽车
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皮皮学刷刷变学霸
举一反三
【单选题】用原子吸收光谱法测定生物材料中微量镉时，通常选择的分析线是
A.
第一激发态与基态之间发射的共振线
B.
第二激发态与基态之间发射的共振线
C.
第三激发态与基态之间发射的共振线
D.
第一激发态与第二激发态之间发射的共振线
E.
第一激发态与第三激发态之间发射的共振线
【单选题】This school doesn't have ______ it did ten years ago. [ ]
A.
so many students as
B.
many as students as
C.
such few students as
D.
so many as students as
【单选题】In those days, few people liked dancing,_____?
A.
didn’t they
B.
did they
C.
don’t they
D.
were they
【简答题】2018年我国原油进口依存度 %，天然气为45.3%，铀进口依存度已达90%。
【单选题】用原子吸收光谱法测定时,通常选择的分析线是
A.
第一激发态与基态之间发射的共振线
B.
第二激发态与基态之间发射的共振线
C.
第三激发态与基态之间发射的共振线
D.
第一激发态与第二激发态之间发射的共振线
【单选题】In those days, few people liked taking a bus, _____? [ ]
A.
didn't they
B.
did they
C.
don't they
D.
were they
【单选题】When the students did badly， the teacher became really ________ and didn‘t smile for weeks.
A.
depressed
B.
depressing
C.
bored
D.
boring
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