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【简答题】
Mein Bruder kommt _____ sein___ Lehrer.
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【单选题】According to the passage, what is the foundation of cooking delicious food? kitchen sanitation ensure food safety clean all food surfaces sanitize all food surfaces
A.
kitchen sanitation
B.
ensure food safety
C.
clean all food surfaces
D.
sanitize all food surfaces
【简答题】"food safety " 和 "food security"的区别
【单选题】One area that is often overlooked in HIV care is the importance of food safety and food-borne illnesses. But for an HIV positive person, food safety is important.
A.
carried by food
B.
with the features of food
C.
ready-made food
D.
uncooked, organic food
【单选题】—Chinese people are worried about the food they eat these days. —Yes, the food safety is a serious in our country. We should try to solve it.
A.
subject
B.
program
C.
problem
D.
opinion
【简答题】在三相交流电路中，已知：平衡三相系统的电阻1.0Ω，相电抗1.0Ω，负荷电流20A，线路？端电压660V，线路电力的功率角为30°（cos30°=0.886，sin30°=0.5）求线路的电压损失ΔU。
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