研究表明,学习的熟练程度达到()%,记忆效果最好。
A. 100
B. 150
C. 200
D. 50
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做比色分析时,应将装有溶液的比色皿哪一面对准光路?
Effects which are dutiable or subject to prohibitions or restrictions should be declared in ().
A. CREW LIST
B. PERSONAL EFFECTS LIST
C. PASSENGER LIST
D. GENERAL DECLARATION
掘进机刮板链的松紧程度应保持在()
A. 30~50mm
B. 40~50mm
C. 50~60mm
承重模板应横向同时、纵向对称均衡卸落。
A. 正确
B. 错误