渗透压冲击是各种细胞破碎法中最为温和的一种,适用于易于破碎的细胞,如动物细胞和革兰氏阴性菌。
参考答案:对
—Cherry wants to know if you ________ a picnic tomorrow.
—Yes. But if it ________, we’ll visit the museum instead.
A. will have; rains
B. will have; will rain
C. have; rains
菌根对苗木的作用如何?