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【单选题】

200号溶剂汽油,200升油桶定量灌装的规定是()

A.
冬季为128公斤、夏季为140公斤
B.
冬季为135公斤、夏季为145公斤
C.
冬季为140公斤、夏季为151公斤
D.
冬季为145公斤、夏季为140公斤
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【单选题】电控汽油喷射发动机怠速控制阀的作用是()。

A.
冷启动
B.
测量进气量
C.
自动调整怠速
D.
海拔高度补偿器

【单选题】一般来说,汽油馏分中的环烷烃主要是()。

A.
单环环烷烃
B.
双环环烷烃
C.
三环环烷烃
D.
四环环烷烃

【单选题】Part ADirections: Read the following four texts.Answer the questions below each text by choosing A, B, C or D.(40 points)The long year of food shortage in this country have suddenly given way to appar...

A.
The abundant food supply is not expected to last
B.
Britain is importing less food
C.
Despite the abundance, food prices keep rising
D.
Britain will cut back on its production of food

【单选题】The long year of food shortage in this country have suddenly given way to apparent abundance. Stores and shops are choked with food. Rationing (定量供应 ) is virtually suspended, and overseas suppliers ha...

A.
the fall in world food prices would benefit British food producers
B.
an expansion of food production was at hand
C.
British food producers would receive more government financial support
D.
it looks depressing despite government guarantees

【单选题】近年来,我国许多城市禁止汽车使用含铅汽油,其主要原因是

A.
提高汽油燃烧效率
B.
降低汽油成本
C.
避免铅污染大气
D.
增强汽油的抗爆性

【单选题】定量检测AFP不能采用

A.
ELISA
B.
RIA
C.
对流免疫电泳
D.
荧光偏振免疫
E.
电化学发光