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【单选题】
射线作用于机体水分子产生的多种自由基与生物大分子作用,引起生物分子的损伤,属于A.
确定性效应
B.
随机性效应
C.
直接作用
D.
间接作用
E.
以上都不对
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举一反三
【单选题】Water evaporates or steam condenses at the saturation temperature, which depends upon the pressure, the higher the pressure （） the saturation temperature.
A.
the more
B.
the higher
C.
the lower
D.
the highest
【简答题】简述全血最佳保存温度为2~6°C的原因。
【单选题】When a sudden increase in steam demand occurs from the boiler, the water level in the drum at the higher pressure will .
A.
rise quickly
B.
rise slowly
C.
drop quickly
D.
drop slowly
【单选题】The higher the water turbulence such as wave action, the higher the relative number of:
A.
Planktonic species.
B.
Deposit feeders.
C.
Suspension feeders.
D.
Primary producers.
【判断题】For dissolved oxygen ( DO), the higher the standard index, the better the water quality.
A.
正确
B.
错误
【单选题】太阳电池分选机所配空气压缩机正确开机顺序为______。
A.
供气阀-电机开关-电路开关
B.
电机开关-电路开关-供气阀
C.
电路开关-供气阀-电机开关
D.
电路开关-电机开关-供气阀
【单选题】Mean high water is the average height of ______.
A.
the higher high waters
B.
the lower high waters
C.
the lower of the two daily tides
D.
all high waters
【单选题】接待计划是组团旅行社委派各地方接待社组织落实旅游团活动的( )安排,是导游人员了解该旅游团基本情况和安排活动日程的主要依据。
A.
组织性
B.
文件性
C.
契约性
D.
主导性
【单选题】__________________________________ 5 Around 1400 BC (about 3,400 years ago), water clocks were invented in Egypt. The name for a water clock is clepsydra. A water clock was made of two containers of w...
A.
Dividing the day into hours, minutes,and seconds
B.
Using the sun
C.
Dividing the year into months and days
D.
Sundial clocks
E.
Water clocks
F.
Pendulum clocks
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