When the transmission route of the transverse feed is consistent with that of the longitudinal feed, 2f横 =f纵，
举一反三
- All visitors are asked _____ the animals in the Zoo. A: to not feed B: not feed to C: to feed not D: not to feed
- When you feed a tool according to the machine's feed dial, what should you do if you feed two more scale lines? ( ) A: Directly back two scale lines B: Back half a circle, and then feed the tool C: There is no need to deal with D: All of the above is correct.
- The leaves and stems of the aifaifa plant are the only parts of the plant ___________________. A: the uses for livestock feed B: for using livestock feed C: used for livestock feed D: they are used for livestock feed
- 已知\( y = {f^2}(x) \)，假设\( f(u) \)二阶可导，则 \( y'' \)为（ ）. A: \( 2{[f'(x)]^2} + 2f(x)f'(x) \) B: \( 2[f'(x)] + 2f(x)f''(x) \) C: \( 2{[f'(x)]^2} + 2f(x)f''(x) \) D: \( 2{[f'(x)]^2} + f(x)f''(x) \)
- In order to reduce feed waste, the thickness of the feed should not exceed the trough ( ). A: 1/3 B: 1/2 C: 2/3 D: 1/4