【多选题】下列关于污染水体溶解氧浓度昼夜变化的描述正确的是()。
C.
随着水体自净作用的进行,溶解氧浓度昼夜差异增大
D.
随着水体自净作用的进行,溶解氧浓度昼夜差异减小
【单选题】The shop______ its summer stock to be ready for the new winter goods.A.sold outB.sold downC.sol
A.
281. The shop______ its summer stock to be ready for the new winter goods. A.sold out
【单选题】如果 线性无关,且 不能由 线性表示,则 ( )
【单选题】下列程序段的执行结果为 Dim A(10, 10) For I=2 To 4 For J=4 To 5 A(I,J)=I*J Next J Next I Print A(2, 5)+ A(3, 4) + A(4, 5)
【单选题】Posted April 10 Part-Time Help Wanted Hanoi Sporting Goods Co. 2 Lam Son Square St, Dl, Hanoi, Vietnam Phone: (844) 9703744 Hanoi Sporting Goods has a job opening for part-time help starting in June. ...
A.
Working hours are flexible.
B.
The job includes some computer use.
C.
Candidates must be available to start work on May 10.
D.
Applicants should apply in person at the store.
【简答题】若向量组α,β,γ线性无关,问向量组α,α+β,α+β+γ是否也线性无关?