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【简答题】
按误差来源分,下列情况产生何种误差 ( 系统、偶然 ) 。天平的零点突然变动 误差;测定 Fe 含量时,其他试剂中含有微量的 Fe 属 误差; 重量分析中,沉淀溶解损失 误差;读取滴定管读数时,最后一位数值估测不准 误差。
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举一反三
【单选题】Fortunately, the accident didn't many people, for there was little traffic at that hour.
A.
stuff
B.
hurt
C.
involve
D.
polish
【单选题】Fortunately, the accident didn't ______ many people, for there was little traffic at that hour.
A.
resolve
B.
revolve
C.
envolve
D.
involve
【单选题】---You seem to have had that car for years. ---Yes, I should sell it ________ it still runs.
A.
before
B.
during
C.
until
D.
while
【单选题】Fortunately, the accident didn't ________many people, for there was little traffic at that hour.
A.
revolve
B.
involve
C.
revolved
D.
involved
【单选题】Fortunately, the accident didn't______ many people, for there was little traffic at that hour.
A.
confine
B.
involve
C.
distinct
D.
reconcile
【简答题】Do American children still learn handwriting in school? In the age of the keyboard, some people seem to think handwriting lessons are on the way out. 90% of teachers say they are required to teach han...
【单选题】Even though “faraway” countries now seem closer, thanks to air travel, they _____ still be different from your home country.
A.
must
B.
may
C.
should
D.
shall
【单选题】Fortunately, the accident didn't ______ many people, for there was little traffic at that hour.
A.
resolve
B.
revolve
C.
evolve
D.
involve
【单选题】—You seem to have had that car for ages. —Yes, I should sell it_________ it still can run.
A.
before
B.
after
C.
until
D.
while
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