简述呼吸、心脏骤停的主要原因。
参考答案:
原因意外事件、器质性心脏病、神经系统病变、水电解质及酸碱平衡紊乱、手术和麻醉意外、药物、毒物中毒等。
.Banks accumulated a great deal of knowledge about plants and agriculture. In growing strawberries he went back to the abandoned ______ of spreading straw under the fruit to reduce the necessary amount of watering..
A.custom
B.approach
C.practice
D.principle
随着光照强度进一步增加,净光合速率又减慢,直到光合速率不再增加时的光照强度称之为()