Variabledisplacementpumpsusedinhydraulicsystems
A. providevariableflowrate
B. consumelessenergy
C. generatelessheat
D. alloftheabove
欲在CBM准确检索物质1,25-(OH)2D3,检索式应为 ( )
A. 1,25-(OH)2D3
B. ‘1,25-(OH)2D3’
C. (1,25-(OH)2D3)
D. 1,25-(OH)2D3
E. NM=1,25-(OH)2D3