常量滴定管、半微量滴定管的最小分度值各是多少?
参考答案:
常用滴定管:0.1ml;半微量滴定管和微量滴定管0.05ml或0.02ml,微量滴定管0.01ml
丝绸服装的主要原料来自下列哪种昆虫分泌物( )
A.蜂
B.蝉
C.蜘蛛
D.蚕
The primary barrier of a bulk carrier is formed by().
A.the single skin side shell and the inner bottom
B.deck strips,hatch covers and coamings
C.the vertically corrugated transverse watertight bulkheads
D.the single skin side shell between topside and hopper tanks,and the cross deck strips,hatch covers and coamings