The design water depth of a pool is 6m, and the shortest time for full water test is () days
A.3.5
B.4.0
C.4.5
D.5.0
Answer:D
The design water depth of a pool is 6m, and the shortest time for full water test is () days
A.3.5 B.4.0 C.4.5 D.5.0