What does arr[-2] return given the array ‘arr = [2,4,6,8,10]’?
A. 2
B. 4
C. 6
D. 8
E. 10
F. Index out of bounds error
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Which of the following commands gives us all even numbers from the array ‘arr = [0,1,2,…,10]?
A. [x for x in arr if x%2==0 in arr]
B. [2*x for x in arr if x<6 in arr]
C. Both are correct
盐度是指()海水中溶解的固体盐类物质的总克数。
A. 10g
B. 100g
C. 500g
D. 1000g
随海水深度的增加,溶氧量()。
A. 持续增加
B. 持续降低
C. 先增加后降低
D. 先降低后增加
海水的pH条件下,会形成析氢腐蚀的金属有()
A. Pb
B. Zn
C. Mg
D. Cu