水磨石面层砂浆色粉与石子的参考比例。当石子的空隙率小于40%时，色粉：石子(质量比)=1:3或1:4。( )
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一般抹灰用于浴室、潮湿车间等墙裙、勒脚或地面基层，其体积配合比为：水泥:砂=1:5或1:6。( )
A. 对
B. 错
Inspection system X and inspection system Y, though based on different principles, each detect all product flaws, but they each also erroneously reject three percent of flawless products. Since false rejections are very costly, money will be saved by installing both systems, instead of either one or the other, and rejecting only products found flawed by both. The argument above requires which of the following assumptions
A. The three percent of flawless products that system X rejects are not all the same products, piece for piece, that system Y erroneously rejects.
B. It is less costly to accept a flawed product than to reject a flawless one.
C. In their price range, systems X and Y are the least errorprone inspection systems on the market.
D. Whichever system performs the second inspection needs to inspect only products not rejected by the first system.
E. Any way of detecting flaws, other than by using either system X or system Y, requires complete disassembly of the products.
混合砂浆多用于室内混凝土、梁、柱、墙、顶棚的底层和中层及砖砌体的室外抹灰等。( )
A. 对
B. 错
Ounce for ounce, blends of different artificial sweeteners match any individual artificial sweetener in sweetening power. When used to sweeten food, blends greatly decrease the likelihood that consumers will exceed acceptable daily intakes for individual sweeteners. Blends should therefore be used, rather than single sweeteners alone, since blends are clearly more healthful, yet equally effective. The argument above depends on which of the following assumptions
A. When ingested together, different artificial sweeteners in the blends do not interact in a way that makes them harmful to human health.
B. Different artificial sweeteners, when used together in food, do not contribute a more desirable flavor to the food than would any one of them by itself.
C. The acceptable daily intake for any given artificial sweetener is a conservative figure that could probably be greatly exceeded at little or no risk.
D. Consumers who substitute artificial sweeteners for sugar in their diets generally keep track of their daily intake of different sweeteners.
E. The ill effects on health produced by the intake of excessive quantities of any single artificial sweetener cannot be reversed by reducing intake later.
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