A heartbeat starts with the generation of an electrical signal at the sinoatrial node (SA node)—the heart’s natural pacemaker—and that signal subsequently passes to the atrioventricular node (AV node). On an ECG, this is what the P wave, that first little blip, represents. Footage fromP...
of the (4)___.The heart hasfour chambers: two on the right and two on the left. Two upper chambersare called (5)___(one is an atrium). Two lower chambersare called ventricles. The heart pumps by expanding and contracting of cardiac muscle.How does...
1.【答案】me【解析】句意:对我来说,它是看到需要朋友的人。根据句意可知,此处要表达“我”这一含义,又因为介词“for(对...来说)”后面跟宾格,所以填me。2.【答案】seats【解析】句意:这些长椅是座位。根据句意可知,此处要表达“座位”这一含义,又因为“thesebenches(这些长椅)”是复数,所以填seats。
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These tests include continuous ambulatory cardiac monitoring, coronary angiography and readings obtained from the use of an electrocardiogram (ECG). It is important for doctors to discover whether there is an underlying cause for irregular heart rhythm and heartbeats, especially if the condition persists...
根据下文“Then others will know he or she is in need of a friend.”可知,一个需要朋友的孩子可以坐在那个椅子上,也就是说坐在那个椅子上的孩子是孤单的,是需要朋友的;据此可以推断,划线单词“lonely”意为“孤单的”。故选C。 (2)题详解: 细节理解题。根据第二段“A lonely child can sit on it...
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What he looked for in others was a “good heart”,and if he found one,the owner was good enough for him.请问这句话中文意思是什么? 答案 他在其他人身上找寻的是一颗美好的心灵,如果他找到这样一颗,那么这颗心的主人对他而言,也足够好了.相关推荐 1What he looked for in others was a “good ...
(局促不安)to be seen with my father.He was severely crippled(破的)and very short,and when we 1 walk together,his hand on my arm for 2 ,people would 3 .I would inwardly squirm(局促不安)at the unwanted attention.But as we started out,he always said,“You set the pace.I will try ...
Eyes are the windows of our mind. Everyone knows the importance of the eyes. So how to protect our eyes Here is some advice. First, we shouldn’t let our eyes work for long. Second, when we are reading, we should keep the book about a foot away from us. After reading for an hour...