()是良好的逆向物流管理的关键。
A、起始点控制
B、时间性
C、产品质量控制
D、数量控制
参考答案:C
Astronomers and scientists think that a black hole is a region of space ______ which matter has fallen and _______ which nothing can escape.
A.into; from
B.towards; towards
C.out of; from
D.through; through
抖法在四肢操作时,其抖动幅度和频率的要求()
A.幅度由大到小,频率由缓到快
B.幅度先大而小,频率先快渐慢
C.幅度由小而大,频率由缓后快
D.幅度和频率要保持均匀