Which of the following problems could cause air to blow out through the inlet air filter of a running compressor?()
A. Excessive compression in the cylinder
B. A broken intake valve
C. A dirty inlet filter element
D. An improperly adjusted discharge valve
凡具有安定神志功效的药物,称为安神药;分重镇安神药和养心安神药两类。
A. 正确
B. 错误
当新鲜催化剂中()μm的细粉含量在()%时,流化和再生性能好,气体夹带损失也不大。
A. <40,20~30
B. <40,15~20
C. >40,20~30
D. >40,15~20
壳斗科植物的花是单被花,无花瓣,花单性;果实为坚果,总苞在果成熟后木质化就()。