Quan hệ giữa giun sán với người thuộc quan hệ

A. hợp tác.

B. cạnh tranh.

C. hãm sinh(ức chế - cảm nhiễm).

D. kí sinh.

Câu 1 :

X + HCl -> XCl₂ + H₂

0,02 0,02 (mol)

nH₂= \(\dfrac{0,448}{22,4}\) = 0,02 mol

M_X = \(\dfrac{mX}{nX}\) = \(\dfrac{0,8}{0,02}\) = 40 ( Ca )

Vậy kim loại đó là Ca

Câu 2 : hình như đề bị thiếu m của 2 kim loại A và B rồi

D nhé

( 12 x 98,89 + 13 x 1,11 ) : 100 = 12,011
-> Chọn B

Mark the letter A,B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

Had the announcement been made earlier, more people wouls have attended the lecture.

A. The lecture was held so late thet a few people attended it

B. More people came late to the lecture because of the late announcement

C. The late announcement helped make the lecture well- attended

D. Few people came to the lecture because the announcement was not made earlier