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【简答题】
生物碱的氮原子周围引入吸电子基团如（ ）等，使生物碱碱性减弱。
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皮皮学刷刷变学霸
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A.
TRUE
B.
FALSE
C.
NOT GIVEN
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【单选题】在喷嘴挡板机构中,若喷嘴严重脏堵,其背压室压力P0应该是 。
A.
P0≈0
B.
P0=0.02MPa
C.
P0=0.06MPa
D.
P0≥0.01MPa改为0.1MP
【单选题】The grandmother often went to the pawnbroker with her jewelry due to the fact that
A.
Her husband often got drunk and the family needed money.
B.
Her husband was a gambler and lost heavily.
C.
Her husband often gave money to needy immigrants, widows, and religious students.
D.
Her husband was a rabbi in Boston and had a charity association that needed support.
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