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【单选题】
下列情况中会引起偶然误差的是A.
砝码腐蚀
B.
天平两臂不等长
C.
试剂中含有微量待测组分
D.
电压的微小变化
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反馈参考答案：
举一反三
【单选题】According to the interviewee, which section of population should free birth control techniques be NOT compulsory?
A.
Upper-middle class people.
B.
High IQ intelligentsia.
C.
Those who have less than three children.
D.
Those who have more than three children.
【单选题】What will the counselors at the office help students do?
A.
Refine their interviewing techniques.
B.
Arrange their work schedules.
C.
Select appropriate courses.
D.
Write cover letters.
【单选题】________ of my sisters are experts in agriculture. Helping the farmers improve their farming techniques _________their duty.
A.
Each; are
B.
Both; is
C.
Neither; are
D.
None; is
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