Hydraulic cranes must be properly warmed-up before being operated because （）.<br>A:warm-up allows the hydraulic system to become charged with oil<br>B:warm-up allows the relief valves to be properly tested<br>C:hydraulic strainers operate only during the warm-up period<br>D:hydraulic fluid must be at the proper viscosity

Hydraulic cranes must be properly warmed-up before being operated because （）.
A:warm-up allows the hydraulic system to become charged with oil
B:warm-up allows the relief valves to be properly tested
C:hydraulic strainers operate only during the warm-up period
D:hydraulic fluid must be at the proper viscosity

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