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【单选题】
以下编码方法中属于有损压缩的是 [ ]。A.
PCM编码
B.
行程编码
C.
哈夫曼编码
D.
算术编码
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皮皮学刷刷变学霸
举一反三
【单选题】He was so deep in thought，thinking of the problem ________ he knocked into the tree without noticing it.
A.
when
B.
while
C.
because
D.
that
【单选题】Before reassembling any machinery, you should _____.
A.
replace all bearings regardless of length of service
B.
apply a heavy coat of oil to all mating surfaces
C.
clean any corroded surfaces and file all burrs smooth
D.
coat all parts with alemite grease
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