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【多选题】
先粗后精方案，其过程是先安排较大 及 的粗加工工序，以便在较短的时间内，将大量的加工余量去掉。A.
背吃刀量
B.
进给量
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举一反三
【单选题】Why does the professor mention fossils?
A.
To describe the evidence Wegener used to develop his theory.
B.
To suggest that Wegener borrowed ideas from earlier scientists.
C.
To explain how Wegener first became interested in geology.
D.
To show why most scientists ridiculed Wegener's theory.
【单选题】Agriculture was a step in human progress ______ which subsequently there was not anything comparable until our own machine age.
A.
to
B.
for
C.
in
D.
from
【简答题】读卡器是一种输入设备。（ ）
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