Damage can occur to the pump if there is not sufficient oil in the reservoir.

A. When it is unlikely that the temperature decreases to -20 ℃, remove the batteries.

B. If it is possible that the temperature will decrease to -20 ℃, remove the batteries.

C. If it is possible that the temperature will decrease to -20 ℃, cut the cells.

A. 前外机身勤务门止动点缺失。

B. 前外机身勤务门止动点失效。

C. 前外机身勤务门止动点凸起。

A. After three full cycles, extend and retract the actuator.

B. You should extend and retract the actuator through three complete cycles.

C. Do nothing to the actuator after three complete cycles.

A. 可以用警告、注意和备注来说明重要的事情，或者强调要点。

B. 使用警告、注意事项和说明来着重强调重要事项。

C. 警告、注意和注释可以用来突出或强调重要的要点。

A. 将齿轮接合到花键轴上。

B. 将起落架轮子接合到键轴上。

C. 将传动装置接合到轴键上。

A. The word given in the approved examples is not controlled

B. The word given in the approved examples is not mandatory

C. The word given in the approved examples is not a must

A. 这等于最大值。

B. 这是最接近的值。

C. 这是无限接近的最大值。

A. Tighten the threads, nuts, clips, or connectors to the correct torque.

B. Tighten the bolts, nuts, clamps, or connectors to the correct torque.

C. Tighten the bolts, spacers, clips, or connectors to the correct torque.

A. 曲线半径必须至少为8mm。

B. 圆的直径必须最小为8mm。

C. 曲线的直径必须最大为8mm。

A. Use the upper latch mechanism to lock the lower display unit in the middle.

B. The latch mechanism at the top is used to secure the center display unit on the bottom.

C. The center lower display unit is installed with the latch mechanism at the top.