下列不是评价受检混凝土性能指标是（）-我要搜题网

[单项选择]预期某证券有40%的概率取得12%的收益率，有60%的概率取得2%的收益率，那么该证券的预期收益率为( )。
A. 5%
B. 6%
C. 7%
D. 8%

[填空题]故障处理后的放行列车条件由___决定。

[多项选择]冬季（）是建筑工程施工现场火灾多发、易发季节。
A. 风干物燥
B. 多雨
C. 用火增多
D. 用电增多

[不定项选择题]共用题干 FDA : Human , Animal Waste Threatens Produce
The biggest food safety risk for fresh fruits and vegetables as they are grown,picked or processed comes from human and animal waste,the US Food and Drug Administration(FD A)said Friday.
More than 9,000 Americans die each year from food-borne diseases and some scientists believe fresh produce is the biggest carrier of contamination.
The FDA issued a set of draft guidelines for US and foreign growers to carefully monitor worker hygiene, water quality,manure management and transportation.
These 34-page draft guidelines urged growers to give workers lessons on basic hygiene such as using soap to wash their hands,covering wounds that could come into contact with produce,and using only clean toilets.
The FDA guidelines identified"the major source of contamination"for fresh produce as human or animal feces.
"We think just proper controls and proper attention to detail would make a big difference in food safety,"said an FDA official."It is our belief that these guidelines would not be very costly."
But grower groups disagreed with the FDA's assessment."Most food-borne disease outbreaks that happen further down the distribution line are due to contamination because people preparing food are not properly washing their hands,"said Stacey Zawal,an official with United Fresh Fruit and Vegetable Association."That is not necessarily true for growers and packers."
Some US grower organizations have expressed concern that the agency is interfering with on-farm practices.Others object to the FDA's proposal to have growers formally document the picking,handling and transportation of produce so that health officials could quickly recall foods if necessary.
Consumer groups criticized the FDA guidelines as of little use because they will not carry the force of law.But stricter regulations could evolve as researchers find new technology or methods to kill harmful bacteria or parasites,the FDA said.
The FDA recommendations are due to be made final by the FDA later this year for use by US and foreign growers.The matter of encouraging foreign growers to adopt the guidelines remains somewhat tricky but FDA officials say it is vital because of the huge amount of imported produce. " Food-borne diseases"in this essay means those diseases______.
A.which people get by eating fruits and vegetables which have been polluted
B.which people get by eating too many kinds of food
C.which many kinds of fruit get when polluted by feces
D.which fruit-growers get by their failure to keep themselves clean

[多项选择]下列不是评价受检混凝土性能指标是（）A. 凝结时间B. 密度C. 含水率D. 收缩率比

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[多项选择]下列不是评价受检混凝土性能指标是（）
A. 凝结时间
B. 密度
C. 含水率
D. 收缩率比