Which forces belong to external forces(). A: spring force B: damper force C: actuator force D: gravity force

The essence of internal force is the force between atoms.

[音频]Norcal Approach:Air Force 1, ____________Air Force 1:________Air Force 1Norcal Approach:...cleared ILS-X runway 16R approachAir Force 1: ________, cleared for ILS-X 16R Air Force 1

可以用（）方法来分析行业的竞争状态。 A: PESTLE分析 B: SWOT分析 C: Ansoff分析 D: 5-force模型分析

In an economy, 42 million people are in the labor force, 38 million are employed, and 47 million are of working age. How many people are not in the labor force? A: 19 percent B: 9 million C: 5 million D: 4 million

After simplification of any force system in space, a force and a couple are obtained. The magnitude of this force is ( ) the principal vector of the force system. A: equal to B: more than C: less than D: not equal to

She tried to calm herself, ________ . A: force B: to force C: forcing D: forced

The unemployment rate is calculated as A: [(labor force) ÷ (population)] × 100. B: [(unemployment) ÷ (population)] × 100. C: [(unemployment) ÷ (labor force)] × 100. D: [(labor force) ÷ (unemployment)] × 100.

force majeure

[音频]Norcal Approach:Air Force 1, contact Reno Tower ____ have a good dayAir Force 1:Air Force 1_______ tower, good day