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【单选题】
A ship can never have lower Security Level than the Port FacilityA.
A ship can have lower Security Level than the Port Facility
B.
A ship can never have higher Security Level than the Port Facility
C.
A ship can never have lower Security Level than the Port Facility
D.
A ship must have the same Security Level than the Port Facility
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举一反三
【简答题】若x 2 =x，则x=______，若x 3 =x，则x=______，若x 3 =x 2 ，则x=______．
【单选题】My sister is very hard-working. She is not only good at her subjects but also she often helps my parents . [ ]
A.
do the dish
B.
do chores
C.
do laundry
D.
do homework
【简答题】水中所含的杂质,按其在水中存在的状态可以分为悬浮物质、 和 三大类。
【简答题】若|x|=1，则x=______，若|x|=-x，则x的取值范围是______．
【简答题】长期目标是指时间跨度为______的目标，短期目标是指时间跨度在______的目标。
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