钢筋焊接及验收规程（JGJ18-2012）：焊接骨架外观质量检查结果，应符合下列哪些要求（）
A. 相邻两焊点不得有漏焊
B. 每件制品的焊点脱落、漏焊数量不得超过焊点总数的4%
C. 应量测焊接骨架的长度和宽度，并应抽查纵、横方向3～5个网格
D. 当外观检查结果不符合上述要求时，应逐件检查，并剔出不合格
E. 对不合格品经整修后，不可提交二次验收
One of the differences between a two-stroke engine and a four-stroke engine is,（）
A. a two-stroke engine works without exhaust operation
B. a two-stroke engine works without compression stroke
C. a two-stroke engine works without expansion stroke
D. a two-stroke engine works without suction operatio
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