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【单选题】
下列方法用于消除试剂和仪器误差的是( )A.
、对照试验
B.
、空白试验
C.
仪器试验
D.
、方法试验
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举一反三
【简答题】Buying ____________(大量地) is more economical than shopping for small quantities.
【多选题】Direction: Fill in the blank s with proper phrase s marked A to O. Write the capital letters only.
A.
was thrust on;
B.
un appreciative of;
C.
with the external
D.
proficiency in English;
E.
with a jerk;
F.
are complementary to
G.
fl u ng from
H.
a lobby against;
I.
was stung by
J.
with large sale; K. absorbed in L. allergic to M. in bulk; N. wouldn ’ t consent to; O. E xposure to ; 1. Buying ____________ is more economical than shopping for small quantities. 2. She never enjoyed the fame that ________________ her. 3. Evidence of basic ________________ is part of the admission requirements. 4. ____________ a second language should take place in elementary school. 5. The old bus started ___________ , so the passengers shook all of a sudden. 6. My parents used to entertain friends ____________ parties. 7. Many groups have together mounted ____________ cuts in hospitals. 8. My aunt never married because her father ____________ her marriage to the person with whom she had fallen in love. 9. Miss Stonehouse told how she saw her baby son __________ his infant car seat when her car was in a collision with another car. 10. Your boss is simply __________ your ideas because he thinks of them as impracticable and based on wrong judgment.
【单选题】In general, _____ is suitable for delivering small quantities at high pressure.
A.
reciprocating pump
B.
gear pump
C.
centrifugal pump
D.
vane pump
【简答题】adv.任然,然而
【多选题】( ) is a situation in which a firm charges a different price for large purchases than for small quantities, so that the price paid varies according to the quantity purchased.
A.
Perfect price discrimination
B.
Nonlinear price discrimination
C.
Group price discrimination
D.
Second-degree price discrimination
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