长时间、( )是发展一般性耐力训练负荷的基本特点。
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一般来讲,没有参加过训练的人在长时间工作过程中,主要以加大呼吸的频率来供给机体氧气的需要,而高水平运动员则主要以加大呼吸的深度来改善对体内氧气的供给。
A. 对
B. 错
少儿耐力训练以有氧耐力为主,青春发育期以前尽量避免无氧耐力训练。
A. 对
B. 错
For the cohesive soils , there are two main internationally accepted size limits, which limits are for silt ?()
A. From 0.02mm to 0.002mm
B. From 0.2mm to 0.002mm
C. From 0.2mm to 0.005mm
D. From 0.075mm to 0.002mm
For non-coherent soils such as gravels, what kind of soil structure does it usually form? ()
A. Massive structure
B. Single grain structure
C. Layer structure
D. Blocky structure